Random review:
“Last week, I was really happy to see a mother sitting at a computer with her 3-year-old son, with TuxPaint up on the screen. The child was squealing with delight as he used the various drawing tools in TuxPaint. Listening to him speak, I noticed he was highly verbal, too.”
— Takoma Park Maryland Library, May 2012

colorable
Work muchs like brushes - you pick the stamp to get the shape, and
then pick the color you want it to be. Nothing about the original
image is used except the transparency (from "alpha" channel).
The color of the stamp comes out solid.

noflip
The stamp cannot be flipped upside-down.

nomirror
The stamp cannot be mirrored left-to-right.

scale
If the full-sized image for a stamp is initially sized too large or small,
a scale factor may be specified. (Scale option may be in a percentage
(e.g., "scale 50%"), a fraction (e.g., "scale 2/1" or
"scale 1:2"), or a ratio (e.g., "scale 2"). An equal ("=") can
be included.)

tintable
This alters the hue of the stamp. (Similar to "colorable," but keeping
the detail of the shape.)